51403720 has 32 divisors (see below), whose sum is σ = 117129600. Its totient is φ = 20299968.

The previous prime is 51403687. The next prime is 51403739. The reversal of 51403720 is 2730415.

It is a junction number, because it is equal to n+sod(n) for n = 51403691 and 51403700.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4974 + ... + 11293.

It is an arithmetic number, because the mean of its divisors is an integer number (3660300).

Almost surely, 2^51403720 is an apocalyptic number.

It is an amenable number.

51403720 is an abundant number, since it is smaller than the sum of its proper divisors (65725880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51403720 is a wasteful number, since it uses less digits than its factorization.

51403720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16357 (or 16353 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 51403720 is about 7169.6387635640. The cubic root of 51403720 is about 371.8189468512.

The spelling of 51403720 in words is "fifty-one million, four hundred three thousand, seven hundred twenty".